It has been said that yoga is one of India’s greatest gifts to the world—a philosophically based system of exercises designed to keep the body strong and healthy and the mind calm and serene. This week, Martha is exploring a different kind of yoga each day at Karma Yoga studio in New York City. Today, she is joined by Sarah Willis, who introduces her to the fundamentals of Ashtanga yoga. As Sarah explains, Ashtanga is a vigorous style of yoga that employs breath-synchronized

Doctors often prescribe medications including synthetic hormones and radioactive iodine to treat thyroid imbalance. “I was told in my early 20s by my doctors that there was no cure, and that I would have to take a hormones everyday for the rest of my life,” says Sarah Willis, owner of Red Hook Yoga Workshop in Brooklyn, New York, and who started practicing yoga 15 years ago to treat her own hypothyroidism.